Pulling out a shade umbrella or opening up a shade over the garden after a damp winter can leave you feeling rather disappointed as there is a strong possibility that it could be a bit damp and smelly.
If you can, remove the fabric and soak it overnight in a big bucket with a cup of vinegar, then rinse thoroughly. If you are not able to remove the fabric, you will need to work with a clean cloth and a solution of 80/20 vinegar and water. I recommend distilled white vinegar for this job as it will not leave any unwanted marks. You may also need to use a soft brush (like an old toothbrush) to work into the folds and stitching of the fabric. Once done wash off with the hose and leave open to dry completely.